I have 5.5GB of memory spread across the 8 memory slots in the G5. Its a bit of a mess but I have: 2x 256 in slots 0-1 2x 512 in slots 2-3 4x 1GB in slots 4-7 Now despite all that memory my G5 seems to puff and pant when I'm running more than one memory intensive app - like editing iPhoto fotos and shuffling iTune playlists etc. I wondered if shuffling the memory into a better configuration (like the 1GBs in the first slots?) would make any difference? OR if I tried upgrading the 256s to 1GBs? Now if i go down this path, can i simply switch them - or will i lose data? Sorry if these are silly Qs THANKS!